论文部分内容阅读
为明确花铃期棉花叶面喷施尿素的适宜浓度,以中棉所79号为材料,采用随机区组试验,设0.00(CK)、0.01、0.02、0.03、0.04 kg·L-15个浓度的15N-尿素处理,于花铃期进行叶面喷施,并利用15N同位素示踪技术,研究叶施尿素对棉株氮素分配规律及生理生化特性的影响。结果表明,喷施15N-尿素各处理棉株根、茎、叶、花铃中15N含量变化趋势相同,均随着喷施浓度的增加而升高;15N含量在棉株各部位的分配规律基本相同,即根7.5%~8.5%、茎12.6%~13.4%、叶45.5%~47.5%、花31.9%~32.7%。根据拟合的回归方程确定花铃期棉花叶面喷施尿素的适宜浓度为0.0324kg·L-1(6.78kg·hm-2)。此外,花铃期叶面施氮可以增强硝酸还原酶、谷氨酰胺合成酶活性,增加叶面积,形成合理的群体叶面积系数,提高叶绿素含量,促进光合作用,从而促进棉株的生长发育,提高棉花产量。本研究为棉花专用叶面肥的研制提供了理论数据。
In order to clarify the appropriate concentration of urea sprayed on cotton leaves at flower and boll stage, Zhongmian No.79 was used as a random sample to test the concentration of 0.00 (CK), 0.01,0.02,0.03,0.04 kg · L-15 The 15N-urea treatment was applied to foliar spraying at the flowering and boll stage, and the effects of applying urea on the nitrogen distribution and physiological and biochemical characteristics of cotton plants were studied by 15N isotope tracing technique. The results showed that the content of 15N in root, stem, leaf and flower of cotton treated with 15N-urea was the same, all increased with the increase of spraying concentration. The distribution of 15N in cotton The same root 7.5% ~ 8.5%, stem 12.6% ~ 13.4%, leaves 45.5% ~ 47.5%, flower 31.9% ~ 32.7%. According to the fitted regression equation, the appropriate concentration of urea sprayed on cotton leaves at flower-boll stage was 0.0324kg · L-1 (6.78kg · hm-2). In addition, nitrogen application at the leaf-boll stage enhanced nitrate reductase and glutamine synthetase activity, increased leaf area, formed a reasonable population leaf area index, increased chlorophyll content, promoted photosynthesis, and promoted cotton plant growth and development, Increase cotton production. This study provides theoretical data for the development of cotton special foliar fertilizer.